We skipped our last meeting because we didn't have any issues to triage and nobody wanted to listen to me swear while debugging my latest problem. This week we have a couple of issues.
When I download & run installer in MS Edge it does not pop up on top of the browser, from @jozefizso, reports that a WixStdBA bundle doesn't appear in front of the browser when launching it from Microsoft Edge. There might not be much we can do about that -- Windows is extra-protective about trying to prevent apps from "stealing" focus. We're also curious if the problem reproduces in the new Chromium-based Edge (a.k.a. Credge), which will replace "old" Edge.
Use WiX Toolset as a C# library - .NET Core support, from @drauch, requests a .NET Core implementation of the DTF managed-code libraries. It turns out that the current .NET 2.0-based DTF works fine with .NET Core. WiX v4 is built with .NET Core and uses DTF extensively.